Cosmos Flower Time. Cosmos are adaptable to almost any kind of soil but they do need moisture to germinate. Plant out in late AprilMay after the danger of frost has passed.
If you have no blooms on your cosmos it may be that they are not mature enough to produce bloom. Jun 29 2020 Sow the seeds gently for about. After that though your flowers should continue to bloom until the next frost.
Watch Monty Don plant out cosmos for a late summer display.
Plant out in late AprilMay after the danger of frost has passed. Fill the tray with any standard potting soil. Start 4 to 6 weeks before you expect to be able to plant your cosmos outside. The daisy-like flowers of chocolate cosmos measure 1 across and are very attracive to butterflies.